Nuclei
Define the atomic mass unit (u).
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One atomic mass unit (u) is defined as 1/121/121/12th of the mass of a carbon (12C{ }^{12} \mathrm{C}12C) atom. Its value is approximately 1.660539×10−27 kg1.660539 \times 10^{-27} \text{ kg}1.660539×10−27 kg.
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